19420731 has 12 divisors (see below), whose sum is σ = 30602520. Its totient is φ = 11770080.

The previous prime is 19420727. The next prime is 19420733. The reversal of 19420731 is 13702491.

19420731 = 573² + 574² + ... + 626².

It is not a de Polignac number, because 19420731 - 2² = 19420727 is a prime.

It is a super-2 number, since 2×19420731² = 754329585148722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19420695 and 19420704.

It is not an unprimeable number, because it can be changed into a prime (19420733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97986 + ... + 98183.

It is an arithmetic number, because the mean of its divisors is an integer number (2550210).

Almost surely, 2^19420731 is an apocalyptic number.

19420731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19420731 is a deficient number, since it is larger than the sum of its proper divisors (11181789).

19420731 is a wasteful number, since it uses less digits than its factorization.

19420731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196186 (or 196183 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 19420731 is about 4406.8958462845. The cubic root of 19420731 is about 268.7954157249.

The spelling of 19420731 in words is "nineteen million, four hundred twenty thousand, seven hundred thirty-one".